Subelement G: VHF-DSC Equipment & Comms— Topic :
Question 48G5
Element 7R (GMDSS-RO)What conditions must exist for a completely automatic DSC acknowledgement of a Routine call and change to suggested working channel?
Explanation
For a completely automatic Digital Selective Calling (DSC) acknowledgment of a Routine call and subsequent change to a suggested working channel, the *receiving station's* DSC equipment must be specifically configured for automatic response. Modern DSC radios can be programmed to automatically acknowledge low-priority calls and direct the radio to the agreed-upon working frequency without human intervention, ensuring unattended operation.
Option A is incorrect because DSC calls are transmitted on VHF Ch-70, not Ch-16 (which is for voice distress and calling). Monitoring Ch-16 would not allow for receiving the DSC call, nor would it facilitate an automatic DSC acknowledgment. Option B is incorrect as the receiving station will only switch to and monitor the suggested working frequency *after* the DSC call has been acknowledged and the channel change command processed. Option C is incorrect because, while manual acknowledgment is an option, DSC systems are capable of, and often configured for, automatic acknowledgment of routine priority calls, especially when unattended.
Related Questions
48G3 What would be the appropriate channel selection for follow-on voice communications for a Routine priority call to another vessel?48G4 If the vessel you wish to call is not listed in your VHF address book, what action would not resolve the problem?48G6 What actions will take place upon receipt of a Routine call from another vessel if both vessels are programmed for automatic response and the ECC is no good?49G1 The DSC received call directory usually sorts and stores incoming calls in what manner?49G2 Why would you want to access your MMSI number?